Headlamp: Adjustments

GENERAL INFORMATION
Viper headlamps are equipped with a bubble level to check up and down headlamp alignment. The bubble level is used to assist headlamp alignment when compensating for vehicle ride height changes due to heavy luggage compartment loads. Bubble level adjustments are not to be moved, as they are calibrated at the factory to FVSS1O8 Standards. when headlamp alignment must be adjusted to compensate vehicle ride height change, the vehicle must be positioned on a level surface.

HEADLAMP ALIGNMENT PREPARATION
1. Verify headlamp dimmer switch and high beam indicator operation.
2. Inspect and correct damaged or defective components that could interfere with proper headlamp alignment.
3. Verify proper tire inflation.
4. Clean headlamp lenses.
5. Verify that luggage area is not heavily loaded.
6. Fuel tank should be FULL. Add 2.94 kg (6.5 lbs.) of weight over the fuel tank for each estimated gallon of missing fuel.


HEADLAMP ADJUSTMENT USING ALIGNMENT SCREEN
Alignment Screen Preparation - Roaster

Headlamp Alignment Screen - Roadster:

1. Position vehicle on a level surface perpendicular to a flat wall 7.62 meters (25 ft) away from front of headlamp lens.
2. If necessary, tape a line on the floor 7.62 meters (25 ft) away from and parallel to the wall.
3. From the floor up 1.52 meters (5 ft), tape a line on the wall at the centerline of the vehicle. Sight along the centerline of the vehicle (from rear of vehicle forward) to verify accuracy of the line placement.
4. Rock vehicle side-to-side three times to allow suspension to stabilize.
5. Jounce front suspension three times by pushing downward on front bumper and releasing.
6. Measure the distance from the center of headlamp lens to the floor. Transfer measurement to the alignment screen (with tape). Use this line for up/down adjustment reference.
7. Measure distance from the centerline of the vehicle to the center of each headlamp being aligned. Transfer measurements to screen (with tape) to each side of vehicle centerline. Use these lines for left/right adjustment reference.

Headlamp Adjustment
A properly aimed low beam headlamp will project an angular pattern on the alignment screen. The right half of the pattern will be higher than the left half in front of each headlamp. The vertical left edge of the pattern should be 25 mm (1 in.) to the left of the headlamp center line. The horizontal top edge on the left side of the pattern should be 75 mm (3 in.) below the headlamp center line. The high beam headlamps cannot be aligned. The high beam pattern should be correct when the low beams are aligned properly.

Headlamp Alignment Screws:

To adjust headlamp alignment, rotate alignment screws to achieve the specified low beam hot spot pattern.

Alignment Screen Preparation - Coupe

NOTE: Vehicle must be an a level surface.

Headlamp Alignment Screen Screen - Coupe:

1. Position vehicle on a level surface perpendicular to a vertically flat wall 7.62 meters (25 ft) away from front of headlamp lens.
2. If necessary; tape a line on the floor 7.62 meters (25 ft) away from and parallel to the wall.
3. From the floor up 1.27 meters (5 ft), tape a vertical line on the wall representing centerline of the vehicle. Sight along the centerline of the vehicle (from rear of vehicle forward) to verify accuracy of the line placement.
4. Rock vehicle side-to-side three times to allow suspension to stabilize.
5. Jounce front suspension three times by pushing downward on front bumper and releasing.
6. Measure the distance from the center of head- lamp lens (small indentation on clear outer lens in front of low beam) to the floor. Transfer measurement to the alignment screen (with tape). Use this line for up/down adjustment reference.
7. Measure distance from the centerline of the vehicle to the center of each headlamp being aligned. Transfer measurements to screen (with tape) to each side of vehicle centerline. Use these lines for left/right adjustment reference.

Headlamp Adjustment
A properly aimed low beam headlamp will project an angular pattern on the alignment screen. The right half of the pattern will be higher than the left half in front of each headlamp. The vertical left edge of the pattern should be 25 mm (1 in.) to the left of the headlamp center line. The horizontal top edge on the left side of the pattern should be 63 mm (2.5 in.) below the headlamp center line. The high beam headlamps cannot be aligned. The high beam pattern should be correct when the low beams are aligned properly

Headlamp Alignment Screws:

To adjust headlamp alignment, rotate alignment screws to achieve the specified low beam hot spot pattern.

HEADLAMP ADJUSTMENT USING BUBBLE VIAL

NOTE: Headlamps do not need to be turned "on" for this procedure.

Calibration Procedure

NOTE: Perform the headlamp alignment preparation procedure and position vehicle on a level surface.

1. To adjust for proper up/down aim - rotate adjustment screw until bubble vial reads zero

NOTE: Do not touch bubble vial or attempt to re-calibrate from factory setting.

Headlamp Alignment Using Bubble Vial:

2. To adjust for proper left/right aim - rotate alignment screw until plane of inner lens is centered directly above "zero" dot on bubble vial.